Dilemma....regarding RSVP's

We recently sent our invitations and naturally they are slow in coming back our RSVP date is 7/31 with our wedding being 8/21, our CH wants the final count 2 weeks before which is 8/7...ok....I realize people are busy and they will send them eventually, however FH and I both agreed we would not telephone any guests after the rsvp deadline (we have a wedding website with all the info as well ans sent out STD's)....so I suggested sending the guests our own version of a 'regret' card to them if their rsvp is not sent back....we have been dealing with this rsvp issue with our e-party, the shower (this weekend), and probably our upcoming bachelor/bachelorette parties....he does not understand how people have no etiquette, I do. So this is the question, should I have a card made up and mailed out or ignore the non-rsvp's....I don't want stragglers showing up at our wedding! I'm in my final printing process with thank you cards, menus, seat maps, etc.....help